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Articles 289171 - 289200 of 303009
Full-Text Articles in Physical Sciences and Mathematics
Cultivar Evaluation In High Rainfall Areas, D J. Gillespie
Cultivar Evaluation In High Rainfall Areas, D J. Gillespie
Experimental Summaries - Plant Research
1. Trikkala Evaluation Trial 76MT3. A joint trial with D.A. Nicholas. The trial's aim is to compare the competitive ability under grazing of Trikkala and Yarloop clover on a waterlogged new land site. The competitive ability to be measured in the presence and absence of clover scorch. (Kabatiella caulivora). 2. Pasture deterioration. Field experiments. Three trials established in 1975 to determine whether various cultivation techniques could control root rot and. subsequent pasture deterioration have now concluded. 3. Lucerne productivity and persistence. 4. Effects of saline irrigation water on pasture production. During the 1976/77 irrigation season the effects on pasture production …
Longevity Of Doublegee Seed Under Continuous Pasture, D J. Gilbey
Longevity Of Doublegee Seed Under Continuous Pasture, D J. Gilbey
Experimental Summaries - Plant Research
Locality: Avondale, Wongan Hills and Chapman Research Stations. Background. Since 1974 pegged areas on the three research stations have been under continuous pasture and have been sampled annually to study the fate of the viable doublegee seed population. Each site was sprayed for doublegee control in the growing season before the first samples were taken in late summer of 73/74. The sites were again sprayed in the 1974 growing season except for Wongan Hills. The Wongan Hills site was cropped in 1976 and no further data is available. 74C7, 75WH65, 75WH66, 76AL11, 76C9, 76C6, 77C3, 77GE9, 77LC26, 77ME28, 77M028, 77N034, …
Brachiopods From The Caribbean Sea And Adjacent Waters, Arthur G. Cooper
Brachiopods From The Caribbean Sea And Adjacent Waters, Arthur G. Cooper
Studies in Tropical Oceanography
No abstract provided.
Vertical Drainage In Field Cores, Larry G. Wells, R. W. Skaggs
Vertical Drainage In Field Cores, Larry G. Wells, R. W. Skaggs
Biosystems and Agricultural Engineering Faculty Publications
No abstract provided.
Stratigraphy, Depositional Environment And Structure Of The Taconic Allochthon, Central Washington County, New York, Louise D. Jacobi
Stratigraphy, Depositional Environment And Structure Of The Taconic Allochthon, Central Washington County, New York, Louise D. Jacobi
Geology Theses and Dissertations
The Taconic Allochthon contains rocks of Cambrian (?), Cambrian and Ordovician age. It measures approximately 200 kilometers by 25 kilometers and is located in contiguous sections of New York, Vermont, Massachusetts, and Connecticut. The rocks are predominantly slates with lesser amounts of arenites, wackes, limestone, chert, and conglomerates. All have been subjected to chlorite or biotite grade metamorphism and two tectonic deformations. The study area in central Washington County, New York, contains most of the Taconic sequence, and because of both natural and man-made exposure it is more accessible than most other locations. A lithostratigraphic column has been identified which …
Geology Of The Northern Lewis Hills, Western Newfoundland, Jeffrey Alan Karson
Geology Of The Northern Lewis Hills, Western Newfoundland, Jeffrey Alan Karson
Geology Theses and Dissertations
The Lewis Hills is the southernmost of the four Bay of Islands Ophiolite Complex massifs. These massifs are considered to be the dissected remnants of a once nearly continuous thrust slice of oceanic crust and upper mantle of Early Ordovician age. The Lewis Hills Massif may be divided into three north south trending zones. The eastern zone (Bay of Islands Complex) is composed of variably deformed and recrystallized gabbro, troctolite, wehrlite and dunite cumulates and harzburgite tectonites. The western zone (Little Port Assemblage) consists of greenschist facies metagabbros, diabase dikes and minor quartz-diorite bodies. The central zone (Mount Barren Assemblage) …
Nuclear Spin-Lattice Relaxation And Activation Energies Of Tunnelling Methyl Groups, Peter A. Beckmann, S. Clough
Nuclear Spin-Lattice Relaxation And Activation Energies Of Tunnelling Methyl Groups, Peter A. Beckmann, S. Clough
Physics Faculty Research and Scholarship
The coupling of lattice vibrations with the rotational motion of hindered methyl groups is considered. It is shown that the apparent activation energy for methyl group rotation is determined at relatively high temperatures by the methyl group torsional energy splittings, but at low temperatures it depends on the frequencies of short-wavelength lattice modes which couple relatively strongly with methyl-group rotation. The temperature dependence of the proton spin lattice relaxation time from 6 to 50K is reported for three samples containing methyl groups whose tunnelling frequencies have previously been measured very precisely. They are 4-methyl-2,6-ditertiarybutylphenol (MDBP) and two deuterated derivatives. The …
The Haupt Effect: Coupled Rotational And Dipolar Relaxation Of Methyl Groups, Peter A. Beckmann, S. Clough, J. W. Hennel, J. R. Hill
The Haupt Effect: Coupled Rotational And Dipolar Relaxation Of Methyl Groups, Peter A. Beckmann, S. Clough, J. W. Hennel, J. R. Hill
Physics Faculty Research and Scholarship
A theory is described for the dynamic proton dipolar polarization observed by Haupt (1972) in 4-methylpyridine following a sudden temperature change. The theory differs from that of Haupt in assuming that transitions which change the rotational quantum number of the 4-methyl group by +or-3 occur very rapidly, maintaining thermal equilibrium within each of the three subsets of rotational levels corresponding to the three methyl group proton spin symmetry species A, Ea and Eb. The difference of A and E species populations approaches the new equilibrium value slowly and exponentially, following the temperature jump, and generates dipolar polarization in the process. …
Nuclear Spin Relaxation And Centrifugal Distortion Effects In Dilute Silane Gas, Peter A. Beckmann, E. E. Burnell
Nuclear Spin Relaxation And Centrifugal Distortion Effects In Dilute Silane Gas, Peter A. Beckmann, E. E. Burnell
Physics Faculty Research and Scholarship
We have measured the proton longitudinal spin relaxation rate in dilute gaseous silane (SiH4) between 10−2 and 1 amagats and are able to observe the influence of rotational Q branch centrifugal distortion transitions.
Tarracolimulus Rieki, Nov. Gen., Nov. Sp., Nuevo Limúlido Del Triásico De Montreal – Alcover (Tarragona), Aldemaro Romero Jr., L. Vía Boada
Tarracolimulus Rieki, Nov. Gen., Nov. Sp., Nuevo Limúlido Del Triásico De Montreal – Alcover (Tarragona), Aldemaro Romero Jr., L. Vía Boada
Publications and Research
No abstract provided.
1977 Summary Of Results Of Field Experiments (January 1978), D L. Chatel
1977 Summary Of Results Of Field Experiments (January 1978), D L. Chatel
Experimental Summaries - Plant Research
1. Inoculation. 1.1. High rainfall. 1.2. Low rainfall. 2. Clover Scorch. 3. Rye grass toxicity. LIST OF EXPERIMENTS 1. The responses of varieties of Trifolium yanninicum to inoculation with different strains of rhizobia - Denmark. 2. The response of T. yanninicum to inoculation over two growing seasons - Denmark. 3. The response of white and strawberry clovers to inoculation - Denmark. 4. The response of sub clover to inoculation - spaced row trial - Merredin. 5. The response of sub clover to inoculation - plot trial (Not sampled) - Merredin. 6. The response of sub clover to inoculation - spaced …
Clover And Medic Breeding And Selection 1977, C. M. Francis
Clover And Medic Breeding And Selection 1977, C. M. Francis
Experimental Summaries - Plant Research
Early Maturing Low Oestrogen Crossbreds. Disease Resistant Clovers for-Higher Rainfall Regions. Waterlogging Resistant Clovers (T. yanninicum). Overseas Collections. Early Maturing Medics from Libya. Table 1. Seed Yields of Medicago Species.
Cereal Foliage Disease Survey, T N. Khan, A. G. P. Brown
Cereal Foliage Disease Survey, T N. Khan, A. G. P. Brown
Experimental Summaries - Plant Research
Cereal Foliage Disease Survey A dry season reduced disease to insignificant levels (as measured by this survey) in all areas except the south west. Late rains may have produced some damage to wheat by S. nodorum however but this was probably confined to southern areas. In barley net blotch which has been declining re appeared a major disease in 1977 excepting high rainfall areas, where scald continued to be severe. The level of scald infection was considerably lower which may be associated with relatively higher temperatures and low rainfall. Variety Clipper continued to show high degree of tolerance to net …
Summary Of 1977 Field Trials, M. L. Poole
Summary Of 1977 Field Trials, M. L. Poole
Experimental Summaries - Plant Research
Competition between wheat and annual ryegrass at six rates of seeding wheat, six ryegrass densities and five rates of nitrogen fertiliser (Wongan Hills Research Station) - 77WH6. Time of removal of annual ryegrass from a wheat crop (Wongan Hills Research Station)- 77WH7. Effect of different tillage systems on establishment and yield of wheat (Merredin Research Station) - 77M52. Rapeseed variety trial (Lancelin) - 77MO30. Shedding losses in rapeseed (Mount Barker Research Station) - 77MT25. Time of germination of ryegrass on wheat yield (Wongan Hills Research Station) - 77WH47. Sunflower agronomy trial (Bramley research Station) - 77B5. Other trials: 1. Co-operative …
Planting Systems Investigations, D Tennant
Planting Systems Investigations, D Tennant
Experimental Summaries - Plant Research
Planting systems investigation. l. Planting depths. 2. Soil water (0-lOcm) near planting. 3. Mineralised N near planting. Planting systems investigation. Two trials were initiated on each of five Research Stations in collaboration with G.A. Pearce and J.E. Holmes. Details in respect of treatments, operations, fertilisers, rainfall, yields and weed populations are provided by these officers in their respective reports. For the purposes of this report, attention is drawn to two findings of a preliminary study of similar planting systems in 1976. TABLE 1. DepthS of planting (cm). Means of 40 to 80 estimates - 77A16, 77E18, 77M13, 77MT15, 77WH17. TABLE …
Moisture Responses Of Wheat (Merredin), R Weir
Moisture Responses Of Wheat (Merredin), R Weir
Experimental Summaries - Plant Research
A trial was planted at Merredin in 1976 on Salmon Gum soil with the aim of testing the drought tolerance of Gamenya, Madden and Insignia wheat.
Daily Maximum And Minimum Temperature Forecasts And The Influence Of Snow Cover, Kenneth F. Dewey
Daily Maximum And Minimum Temperature Forecasts And The Influence Of Snow Cover, Kenneth F. Dewey
School of Natural Resources: Faculty Publications
Research into the relationship between snow cover and observed maximum and minimum temperatures is reviewed. An example of the importance of snow cover and forecasting max/min temperatures is presented for this past winter (1976-77). It is shown that there was a warm bias in the MOS temperature forecasts for the northern Great Plains following the receipt of a fresh cover of snowfall. it is proposed that snow cover be incorporated as a conditional predictor to be used only during specific synoptic conditions.
Regular Singular Differential Equations Whose Conjugate Equation Has Polynomial Solutions, Leon M. Hall
Regular Singular Differential Equations Whose Conjugate Equation Has Polynomial Solutions, Leon M. Hall
Mathematics and Statistics Faculty Research & Creative Works
Consider the n -dimensional singular differential system defined by the operator $L:(Ly)(z) = z^p y'(z) + A(z)y(z)$, where z is a complex variable and p is a positive integer. The solvability of the nonhomogeneous system $Ly = g$ depends on the solutions of the homogeneous conjugate system, $L^ * f = 0$, where $L^ * $ is the operator conjugate to L. We show that $L^ * f = 0$ has polynomial solutions if the constant matrix in the series expansion of $A(z)$ has at least one nonpositive integer eigenvalue. Also, we show that if $L^ * f = 0$ …
Absolute Doubly Differential Cross Sections For Ejection Of Secondary Electrons From Gases By Electron Impact. I. 100- And 200-Ev Electrons On Helium, M. Eugene Rudd, R. D. Dubois
Absolute Doubly Differential Cross Sections For Ejection Of Secondary Electrons From Gases By Electron Impact. I. 100- And 200-Ev Electrons On Helium, M. Eugene Rudd, R. D. Dubois
M. Eugene Rudd Publications
We have measured absolute values of the cross sections for ejection of electrons from helium gas by 100- and 200-eV electrons. These cross sections were measured for emission angles from 10° to 150° and for electron energies from 3 eV to a value equal to the primary energy minus the ionization potential. The measurements were made using a static-gas target and an electrostatic analyzer. The resulting cross sections agree reasonably well with those of Opal, Peterson, and Beaty near 90°, but show the need for an adjustment of their angular distributions. Comparison with Born-approximation calculations of Manson et al. at …
Energy And Angular Distribution Of Electrons Ejected From Argon By 5-Kev To 1.5-Mev Protons, T. L. Criswell, L. H. Toburen, M. Eugene Rudd
Energy And Angular Distribution Of Electrons Ejected From Argon By 5-Kev To 1.5-Mev Protons, T. L. Criswell, L. H. Toburen, M. Eugene Rudd
M. Eugene Rudd Publications
Cross sections, differential in emission energy and angle, have been measured for the ejection of electrons in collisions of H+ with argon gas targets. Incident-proton energies studied were from 5 keV to 1.5 MeV and electron emission angles ranged from 10° to 160°. Integration of the double-differential cross sections over emission angle and energy yield results in good agreement with direct measurement of total ionization cross sections. The electron distributions are compared to two plane-wave Born-approximation calculations, one using Hartree-Slater wave functions and the other using Hartree-Fock wave functions in the 3p-εd channel.
K-Theory And Steenrod Homology: Applications To The Brown-Douglas-Fillmore Theory Of Operator Algebras, Jerome Kaminker, Claude Schochet
K-Theory And Steenrod Homology: Applications To The Brown-Douglas-Fillmore Theory Of Operator Algebras, Jerome Kaminker, Claude Schochet
Mathematics Faculty Research Publications
The remarkable work of L. G. Brown, R. Douglas and P. Fillmore on operators with compact self-commutators once again ties together algebraic topology and operator theory. This paper gives a comprehensive treatment of certain aspects of that connection and some adjacent topics. In anticipation that both operator theorists and topologists may be interested in this work, additional background material is included to facilitate access.
Environmental Change And Cultural Change In The Eastern Canadian Arctic During The Last 5000 Years, R. G. Barry, Wendy H. Arundale, J. T. Andrews, Raymond S. Bradley
Environmental Change And Cultural Change In The Eastern Canadian Arctic During The Last 5000 Years, R. G. Barry, Wendy H. Arundale, J. T. Andrews, Raymond S. Bradley
Raymond S Bradley
Archaeological research suggests that cultural changes in the Canadian Arctic are closely linked to environmental changes. Current knowledge of postglacial climate and marine conditions in the eastern Canadian Arctic- an area demonstrably sensitive to small fluctuations in these conditions-is reviewed in the context of the prehistoric cultural sequence. Most of the major cultural events since 4500 BP appear to correlate well with the paleoclimatic conditions inferred from environmental data, although specific causal mechanisms cannot be documented. The expansions of Arctic Small Tool tradition (ASTt) and later of the Thule people seem to be related to warmer climatic conditions, whereas the …
Saturated Superfluid 4he Film Flow: Characteristic Oscillations Induced By Persistent Circulation, Robert Hallock, R. K. Galkiewicz
Saturated Superfluid 4he Film Flow: Characteristic Oscillations Induced By Persistent Circulation, Robert Hallock, R. K. Galkiewicz
Robert Hallock
We report observations of characteristic reservoir oscillations induced by persistent circulation in saturated 4He films for several different geometries. The shape of the oscillation structure appears to be in qualitative agreement with the predictions of Campbell. Within the constraints imposed by theoretical approximations and uncertainties in the experimental parameters, the quantitative agreement is satisfactory.
Fifty Years Of Uncertainty, Richard C. Heyser
Fifty Years Of Uncertainty, Richard C. Heyser
Unpublished Writings
Richard C. Heyser frequently explores ways to find a "mathematical basis for perception" in his writings. In this article, Heyser discusses implementing geometry elements to quantum physics.
Compton's 'Crucial Test' - Theoretical Preconceptions And Experimental Interpretation, Roger H. Stuewer
Compton's 'Crucial Test' - Theoretical Preconceptions And Experimental Interpretation, Roger H. Stuewer
Journal of the Minnesota Academy of Science
Arthur Holly Compton, as a result of his own research and confidence in the validity of classical electrodynamics, was convinced in 1921 that homogeneous x-rays and gamma rays could be affected in only two possible ways when passing through matter: either they gave rise to "truly scattered" radiation of the same wavelength as that of the incident rays, or they excited "fluorescent" radiation of a longer wavelength. When Compton was led to carry out experiments using homogeneous x-rays and actually found secondary radiation of longer wavelength, he regarded his result as a crucial test between the "truly scattered" and the …
Atomic Numbers Revalued, Frank H. Meyer
Atomic Numbers Revalued, Frank H. Meyer
Journal of the Minnesota Academy of Science
As a general physical theory, the Reciprocal System of D.B. Larson covers all physical fields, including atomic physics . Inasmuch as all of the conclusions reached in the theoretical development are derived entirely by deduction from the basic postulates of this system, the conclusions provide information that is completely independent of observation. The theoretical development indicates that the Mosely atomic number mathematical formula is quite right, and the Rutherford-Bohr-Mosely nuclear atom physical interpretation of atomic number is seriously wrong. The discrete units constituting atoms evidently are not neutrons and electrically charged particles. Nor are atoms made up of parts, a …
Successive Month Temperature Relationships For Twin Cities, 1820-1974, Charles J. Fisk
Successive Month Temperature Relationships For Twin Cities, 1820-1974, Charles J. Fisk
Journal of the Minnesota Academy of Science
Using a five category classification scheme of mean monthly temperatures, the long-term ( 1820-1974) relationships between Minneapolis-St. Paul successive months' temperatures were analyzed . Results show predominance of two-month persistence over two-month breaks in classification . Strong above norma11 and below normal persistence tendencies are revealed, particularly in summer and early fall sequences. In contrast, two month breaks in classification appear in spring and fall sequences. This emphasizes the uneven progression of warming (cooling) that occasionally occurs between winter (summer) and summer (winter). Overall, strongest month-to-month association was for August-September, weakest for April-May .
Positive Perturbations Of Unbounded Operators, Joanne Dombrowski
Positive Perturbations Of Unbounded Operators, Joanne Dombrowski
Mathematics and Statistics Faculty Publications
This work studies the spectral properties of certain unbounded selfadjoint operators by considering positive perturbations of such operators and the unitary equivalence of the perturbed and unperturbed transformations. Conditions are obtained on the unitary operators implementing this equivalence which guarantee that the selfadjoint operators have an absolutely continuous part.
Evaluation Of An Experiment After Analysis Of Variance, Abdullah Sulaiman Atheem
Evaluation Of An Experiment After Analysis Of Variance, Abdullah Sulaiman Atheem
All Graduate Plan B and other Reports, Spring 1920 to Spring 2023
If experimental data are obtained according to an experimental design for which analysis of variance (AOV) is appropriate, the result of the analysis is one of the following decisions:
1. A significant difference exists among treatment effects.
2. No significant difference exists.
Interpretation in the first case has been studied very thoroughly by many statisticians resulting, for example, in the multiple comparison procedure. Too often, in the second case, the AOV analysis is thought to be completed with no further attempt to interpret a nonsignificant outcome.
Of the many possible explanations for significance in the first case, the multiple comparison …
Specific Hypotheses In Linear Models And Their Power Function In Unbalanced Data, Seyed Mohtaba Taheri
Specific Hypotheses In Linear Models And Their Power Function In Unbalanced Data, Seyed Mohtaba Taheri
All Graduate Plan B and other Reports, Spring 1920 to Spring 2023
A hypothesis is a statement or claim about the state of nature. Scientific investigators, market researchers, governmental decision makers, among others, will often have hypotheses about the particular facet of nature, hypotheses that need verification or rejection, for one purpose or another. Statisticians concerned with testing hypotheses using unbalanced data on the basis of linear models have talked about the difficulties involved for many years but, probably because the problems are not easily resolved, there is yet no satisfactory solution to these problems